Graphics.h c++ undefined reference to various functions like line(),initgraph()

Question

#include<graphics.h>
#include<stdio.h>

main()
{
int gd=DETECT,gm;
int i,x,y;
initgraph(&gd,&gm,"");
line(0,0,640,0);
line(0,0,0,480);
line(639,0,639,480);
line(639,479,0,479);
for(i=0;i<=1000;i++)
{
   x=rand()%639;
   y=rand()%480;
   putpixel(x,y,15);
}
  getch();
  closegraph();
}

The Following is a Basic Graphic Program,It Shows the Errors as

undefined reference to 'initgraph'
undefined reference to 'closegraph'
undefined reference to 'line'[4 times]
undefined reference to 'putpixel'

Compiler : CodeBlocks; Language:c++;

I Have Copied the graphics.h and winbgim.h in include folder and the libbgi.a in the lib folder also i have linked all the libraries required to be linked. Please Help.

I think that this question has already been answered : [http://stackoverflow.com/questions/20313534/how-to-use-graphics-h-in-codeblocks][1] [1]: http://stackoverflow.com/questions/20313534/how-to-use-graphics-h-in-codeblocks — Been Forgotten, Jul 18 '15 at 08:12
@BeenForgotten No That Is What I Stated, My Graphics.h file is in the write pace and all the linking has been done , but still it shows undefined reference to.. . — Adit Jain, Jul 18 '15 at 09:23
I think `#include` is the problem. Do not know what compiler/IDE you are using but some have their own `graphics.h` lib that is not BGI so my bet is you are including different lib then you think you are. try `#include "graphics.h"` or #include "drive:\\...path..\\graphics.h" with correct and full path to avoid problems... To check for correct include try to open the file from the IDE if you can (some have that feature just put cursor in the include line inside filename and either right click an use popup menu or hit the shortcut for it like `ALT+Enter`,`CTRL+Enter` or `F3`) — Spektre, Jul 20 '15 at 05:53

score 6 · Answer 1 · edited Sep 17 '21 at 17:18

6

Change

initgraph(&gd,&gm,"");

to

initgraph(&gd,&gm,NULL);

for compiling:

g++ -o filename filename.cpp -lgraph

to execute:

./filename

edited Sep 17 '21 at 17:18

bad_coder

11,289
20
44
72

answered Mar 12 '17 at 17:43

Tushar Nitave

519
4
13

1

Not working for me. I get an error. C:/Program Files/CodeBlocks/MinGW/bin/../lib/gcc/x86_64-w64-mingw32/8.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe: cannot find -lgraph collect2.exe: error: ld returned 1 exit status. Please help me. – AurumTechie Jul 03 '21 at 14:42

score 0 · Answer 2 · answered Apr 06 '22 at 18:05

The functions in graphics.h are only supported by old ancient Turbo C and Turbo C++ compilers. Those functions can not be used by any modern 32-bit compiler. You can either get a copy of that old MS-DOS compiler or use win32 api GDI functions or get one of several graphics libraries such as OpenGL and QT.

Graphics.h c++ undefined reference to various functions like line(),initgraph()

2 Answers2